Find the domain of the function $f(x) = \log_{[x + \frac{1}{x}]} |x^2 - x - 6| + ^{16-x}C_{2x-1} + ^{20-3x}P_{2x-5}$, where $[x]$ denotes the greatest integer function.

  • A
    $\emptyset$
  • B
    $\{4, 5\}$
  • C
    $\{3, 4, 5\}$
  • D
    $\left[ 2.5, 5 \right]$

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